Tejun Heo wrote:
sata_down_spd_limit() first reads the current SPD from SStatus and limit the speed to the lower one of one below the current limit or one below the current SPD in SStatus. SPD may not be accessible or valid when SPD down is requested making sata_down_spd_limit() fail when it's most needed. This patch makes the current SPD cached after each successful reset and forces GEN I speed (1.5Gbps) if neither of SStatus or the cached value is valid, so sata_down_spd_limit() is now guaranteed to lower the speed limit if lower speed is available. Signed-off-by: Tejun Heo <htejun@xxxxxxxxx> --- drivers/ata/libata-core.c | 29 ++++++++++++++++++++++------- drivers/ata/libata-eh.c | 6 ++++++ include/linux/libata.h | 1 + 3 files changed, 29 insertions(+), 7 deletions(-)
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